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United States · Multi-region weather view

Yakima & Central Columbia Basin

Dry wine districts across the Yakima Valley and central Columbia Basin.

Long sunny days, irrigation, wind, and large day–night temperature swings define the season.

Climate comparisons use the 1991–2020 combined regional record · updated through Aug 20, 2026.

Current conditions

Observations through Aug 31, 2026 · 00:35 UTC

Temperature25.3°C
Dew PointUnavailable
Relative HumidityUnavailable
24h Rainfall0.1 mmmodeled IFS total through Aug 29
NWS station average · 3 stations

Temperature, dew point, humidity, and wind are averaged using the same locations and weights as the historical record. The current temperature uses 100% of the configured regional weight.

  • K1S5 — Sunnyside Municipal Airport · 25% regional weight
  • KPSC — Tri-Cities Airport · 50% regional weight
  • KYKM — Yakima Air Terminal - McAllister Field · 25% regional weight

NOAA National Weather Service observations. Station readings are point measurements and may not represent every vineyard elevation or exposure.

Vintage explorer

Compare this vintage →

Moderately warmer and significantly wetter than normal.

Mean temperature17.0°C
Temperature anomaly+0.6°Cvs 1991-2020
Growing degree days1734base 10°C
Hot days28≥ 35°C

What stood out in 2022

Repeated hot days can speed ripening and put vines under stress. A freeze after budbreak can damage new growth and reduce the crop.

More hot days than usual · High confidence

There were 28 days at or above 35°C—+13 days versus baseline.

Repeated hot days can speed ripening and put vines under stress.

Spring freeze recorded · Moderate confidence

The regional record had 4 spring day(s) at or below -2°C.

A freeze after budbreak can damage new growth and reduce the crop.

How unusual was 2022?

The ranking compares vintages that meet the data-coverage threshold and use the same source, regional rules, and 1991-2020 baseline.

Growing-season temperature

9th warmest of 35 vintages Warmer than 26 of 34 other vintages 17.0°C

Growing-season rainfall

5th wettest of 35 vintages Wetter than 30 of 34 other vintages 168.5 mm

Heat accumulation

9th highest of 35 vintages Higher than 26 of 34 other vintages 1735 GDD

Hot days

2nd most of 35 vintages More than 30 of 34 other vintages 28 days

2022 month by month

Compared with 1991–2020

Follow heat accumulation, rainfall, frost exposure, and the region’s growing and harvest windows in calendar order.

Frost watch Growing season Harvest window
  1. 1–31
    Frost watchGrowing season

    Heat accumulation

    2022 15 GDD
    Typical 8 GDD

    Rainfall

    2022 24.2 mm
    Typical 29.0 mm
    2022 freezing days
    9
    Typical
    11.4

    Close to the typical monthly pattern.

  2. 1–30
    Frost watchGrowing season

    Heat accumulation

    2022 8 GDD
    Typical 48 GDD

    Rainfall

    2022 45.8 mm
    Typical 24.4 mm
    2022 freezing days
    10
    Typical
    3.1

    More freezing days than the typical month.

  3. 1–31
    Frost watchGrowing season

    Heat accumulation

    2022 91 GDD
    Typical 167 GDD

    Rainfall

    2022 43.6 mm
    Typical 26.7 mm
    2022 freezing days
    0
    Typical
    0.1

    Heat accumulation ran behind the typical month.

  4. 1–30
    Growing season

    Heat accumulation

    2022 262 GDD
    Typical 267 GDD

    Rainfall

    2022 40.8 mm
    Typical 18.4 mm

    Wetter than the typical month.

  5. 1–31
    Growing season

    Heat accumulation

    2022 461 GDD
    Typical 410 GDD

    Rainfall

    2022 5.2 mm
    Typical 5.9 mm

    Close to the typical monthly pattern.

  6. 1–31
    Growing seasonHarvest window

    Heat accumulation

    2022 474 GDD
    Typical 391 GDD

    Rainfall

    2022 4.8 mm
    Typical 5.9 mm

    Heat accumulation ran ahead of the typical month.

  7. 1–30
    Growing seasonHarvest window

    Heat accumulation

    2022 284 GDD
    Typical 237 GDD

    Rainfall

    2022 4.3 mm
    Typical 9.7 mm

    Close to the typical monthly pattern.

  8. 1–31
    Growing seasonHarvest window

    Heat accumulation

    2022 140 GDD
    Typical 60 GDD

    Rainfall

    2022 17.6 mm
    Typical 24.8 mm

    Heat accumulation ran ahead of the typical month.

View milestone calendar data as a table
Month2022 GDDTypical GDD2022 rainfallTypical rainfall2022 freezing daysTypical freezing days
March 2022 15 GDD 8 GDD 24.2 mm 29.0 mm 911.4
April 2022 8 GDD 48 GDD 45.8 mm 24.4 mm 103.1
May 2022 91 GDD 167 GDD 43.6 mm 26.7 mm 00.1
June 2022 262 GDD 267 GDD 40.8 mm 18.4 mm Outside frost windowOutside frost window
July 2022 461 GDD 410 GDD 5.2 mm 5.9 mm Outside frost windowOutside frost window
August 2022 474 GDD 391 GDD 4.8 mm 5.9 mm Outside frost windowOutside frost window
September 2022 284 GDD 237 GDD 4.3 mm 9.7 mm Outside frost windowOutside frost window
October 2022 140 GDD 60 GDD 17.6 mm 24.8 mm Outside frost windowOutside frost window
Calendar data and method

Monthly values are weighted across every configured regional sample using stored Google ARCO ERA5 daily reanalysis. “Typical” is the mean monthly total across 30 baseline seasons. GDD is counted only inside the configured growing window; freezing days are counted only inside the frost-watch window; rainfall covers every displayed calendar day.

Selected-vintage coverage is 100%. Source rows were last retrieved Aug 20, 2026.

Replay the 2022 growing season

231 daily regional observations

Move through the season to follow temperature, rainfall, accumulated heat, and recorded weather events day by day.

Replay data and method

Daily values are weighted across every configured regional sample using stored Google ARCO ERA5 reanalysis. Coverage is 100%. Source rows were last retrieved Aug 20, 2026.

Closest weather matches

These years had the most similar growing-season and harvest weather.

  1. Closest match

    2006

    Most alike in Harvest precipitation and Spring frost exposure.

    Harvest precipitation
    more rain: 2.2 mm
    Spring frost exposure
    fewer frost-exposure days: 3 days

    Largest difference: Growing-season precipitation — less rain

    View 2006 →

  2. Second closest

    1998

    Most alike in Hot-day count and Growing-season mean temperature.

    Hot-day count
    fewer hot days: 1 day
    Growing-season mean temperature
    cooler: 0.1°C

    Largest difference: Growing-season precipitation — less rain

    View 1998 →

  3. Third closest

    2009

    Most alike in Spring frost exposure and Growing degree days.

    Spring frost exposure
    more frost-exposure days: 1 day
    Growing degree days
    lower: 102 GDD

    Largest difference: Growing-season precipitation — less rain

    View 2009 →
How similar years are calculated

Method analog-v1-2026-07 standardizes six weather measures across 34 complete ARCO ERA5 comparison years, then measures the distance between them. The calculation runs when the page is requested.

Measures used: Growing-season mean temperature (20%); Growing degree days (15%); Hot-day count (15%); Growing-season precipitation (20%); Harvest precipitation (20%); Spring frost exposure (10%).

Calculated distances: 2006 0.657; 1998 0.767; 2009 0.927.

Growing-season temperature anomalyCompared with 1991-2020
Temperature anomaly by vintage, 1991 to 2026 A line above zero indicates a warmer growing season than the 1991–2020 baseline. Select a point to inspect that vintage. +2.4°C −2.4°C 1991 2000 2010 2020 2026
Growing-season rainfall anomaly
Rainfall anomaly by vintage, 1991 to 2026 Bars show millimeters above or below the 1991–2020 growing-season baseline. Select a bar to inspect that vintage. +100 mm −100 mm 1991 2000 2010 2020 2026
View historical chart data as a table
YearTemperature anomalyRainfall anomalyHot days
1991-0.6°C+21 mm12
1992+0.6°C+7 mm22
1993-0.7°C+25 mm3
1994+0.6°C+4 mm16
1995-0.6°C+50 mm4
1996-0.8°C-0 mm16
1997-0.3°C+22 mm6
1998+0.5°C-15 mm27
1999-1.1°C-53 mm10
2000-0.5°C-10 mm6
2001-0.2°C-10 mm12
2002-0.7°C-51 mm12
2003+0.8°C-41 mm20
2004+0.6°C+10 mm20
2005+0.1°C+3 mm13
2006+0.2°C+5 mm21
2007-0.3°C-25 mm13
2008-0.9°C-53 mm14
2009+0.0°C-5 mm20
2010-0.8°C+63 mm7
2011-1.0°C+20 mm3
2012-0.0°C+71 mm16
2013+0.7°C+7 mm17
2014+1.2°C-23 mm23
2015+1.9°C-44 mm28
2016+0.6°C+40 mm18
2017+0.5°C+18 mm28
2018+0.2°C-18 mm18
2019-0.2°C+5 mm4
2020+0.3°C-23 mm16
2021+1.1°C-63 mm38
2022+0.6°C+37 mm28
2023+0.9°C-30 mm18
2024+1.1°C-57 mm28
2025+1.8°C-42 mm23
2026+2.1°C-73 mm14

winter

1.1°C

-0.4°C vs baseline

85 mm rain · -25 mm

spring

9.6°C

-1.3°C vs baseline

113 mm rain · +34 mm

summer

23.0°C

+1.4°C vs baseline

50 mm rain · +21 mm

harvest

18.7°C

+2.7°C vs baseline

22 mm rain · -16 mm

Weather events

Periods that crossed one of the published regional thresholds, shown in date order.

  1. Spring frost exposure

    Minimum temperature
    -1.7°C
    Duration
    4 days
    Severe-freeze days
    0 days

    The regional model recorded freezing temperatures during spring.

  2. Spring frost exposure

    Minimum temperature
    -6.6°C
    Duration
    3 days
    Severe-freeze days
    2 days

    The regional model recorded freezing temperatures during spring.

  3. Spring frost exposure

    Minimum temperature
    -0.5°C
    Duration
    1 day
    Severe-freeze days
    0 days

    The regional model recorded freezing temperatures during spring.

  4. Spring frost exposure

    Minimum temperature
    -0.2°C
    Duration
    1 day
    Severe-freeze days
    0 days

    The regional model recorded freezing temperatures during spring.

  5. Spring frost exposure

    Minimum temperature
    -0.0°C
    Duration
    1 day
    Severe-freeze days
    0 days

    The regional model recorded freezing temperatures during spring.

  6. Spring frost exposure

    Minimum temperature
    -2.3°C
    Duration
    2 days
    Severe-freeze days
    1 day

    The regional model recorded freezing temperatures during spring.

  7. Spring frost exposure

    Minimum temperature
    -2.4°C
    Duration
    6 days
    Severe-freeze days
    1 day

    The regional model recorded freezing temperatures during spring.

  8. Spring frost exposure

    Minimum temperature
    -0.2°C
    Duration
    1 day
    Severe-freeze days
    0 days

    The regional model recorded freezing temperatures during spring.

  9. Dry spell

    Duration
    19 days
    Total rain
    2.8 mm
    Daily cutoff
    1.0 mm/day

  10. Dry spell

    Duration
    36 days
    Total rain
    1.9 mm
    Daily cutoff
    1.0 mm/day

  11. Heat episode

    Peak temperature
    35.7°C
    Duration
    2 days
    Heat accumulation
    32 GDD

  12. Heat episode

    Peak temperature
    36.7°C
    Duration
    2 days
    Heat accumulation
    32 GDD

  13. Heat episode

    Peak temperature
    41.9°C
    Duration
    10 days
    Heat accumulation
    193 GDD

  14. Heat episode

    Peak temperature
    37.2°C
    Duration
    4 days
    Heat accumulation
    68 GDD

  15. Dry spell

    Duration
    37 days
    Total rain
    1.4 mm
    Daily cutoff
    1.0 mm/day

  16. Heat episode

    Peak temperature
    38.4°C
    Duration
    4 days
    Heat accumulation
    70 GDD

  17. Heat episode

    Peak temperature
    35.5°C
    Duration
    2 days
    Heat accumulation
    33 GDD

  18. Heat episode

    Peak temperature
    36.8°C
    Duration
    3 days
    Heat accumulation
    48 GDD

  19. Dry spell

    Duration
    32 days
    Total rain
    2.0 mm
    Daily cutoff
    1.0 mm/day
How events are detected

Weather & Vines combined regional series; method event-timeline-v2-2026-07, rules columbia-valley-catalog-v1-2026-07. Source last updated Aug 1, 2026, calculated Aug 29, 2026. Each configured point must have at least 95.0% coverage.

1991–present

Climate change

Measured regional trends are shown separately from model projections. The observed record ends at the latest complete growing season shared by every published region.

Compare regions

Observed record

Historical trends, 1991–2025

Growing degree days changed +92.3 GDD per decade. The 95% interval is +52.2 to +132.4 GDD per decade, based on 35 eligible vintages.

How it is measured: Across the March 15–October 31 growing season, each day's mean temperature above 10°C adds to the total; cooler days add zero.

Growing degree days · annual change from the 1991–2020 average1991–2025

Scroll horizontally to inspect the full timeline.

View annual growing degree days data
VintageGrowing degree daysChange from 1991–2020
19911494 GDD-92 GDD
19921676 GDD+89 GDD
19931393 GDD-193 GDD
19941689 GDD+102 GDD
19951463 GDD-123 GDD
19961453 GDD-134 GDD
19971521 GDD-65 GDD
19981694 GDD+108 GDD
19991362 GDD-224 GDD
20001454 GDD-132 GDD
20011550 GDD-36 GDD
20021491 GDD-95 GDD
20031740 GDD+154 GDD
20041658 GDD+72 GDD
20051584 GDD-3 GDD
20061628 GDD+42 GDD
20071521 GDD-65 GDD
20081476 GDD-110 GDD
20091633 GDD+47 GDD
20101397 GDD-189 GDD
20111402 GDD-184 GDD
20121591 GDD+5 GDD
20131755 GDD+169 GDD
20141805 GDD+219 GDD
20151940 GDD+353 GDD
20161662 GDD+75 GDD
20171678 GDD+92 GDD
20181608 GDD+22 GDD
20191572 GDD-14 GDD
20201700 GDD+113 GDD
20211821 GDD+235 GDD
20221735 GDD+148 GDD
20231860 GDD+273 GDD
20241797 GDD+211 GDD
20251967 GDD+381 GDD
Growing-season mean temperature
+0.42 °C per decade 95% interval +0.21 to +0.62
Growing degree days
+92.33 GDD per decade 95% interval +52.24 to +132.42
Growing-season precipitation
-7.83 mm per decade 95% interval -17.25 to +1.59
Hot days
+3.81 days per decade 95% interval +2.06 to +5.56
Spring frost days
+0.34 days per decade 95% interval -1.73 to +2.41
Longest dry spell
+4.27 days per decade 95% interval -0.20 to +8.75

Last Updated August 20, 2026

Model ensemble

Projected climate through 2075

Temperature changes are relative to each model’s 1991–2020 baseline. The table combines all three pathways, weighted 70% to SSP2-4.5 and 15% each to SSP1-2.6 and SSP3-7.0.

Scroll horizontally to compare all columns.

PeriodWeighted medianWeighted central 80%Models per pathway
2021-2040+1.0°C+0.5 to +1.6°C25
2041-2060+1.7°C+1.1 to +2.7°C25
2061-2075+2.1°C+1.6 to +3.3°C25
How pathways are combined

For each period and percentile, Weather & Vines takes 70% of the SSP2-4.5 value, 15% of the SSP1-2.6 value, and 15% of the SSP3-7.0 value. Each pathway contains the same 25 models. The weights are an editorial view of the current trajectory, not scenario probabilities.

Last Updated June 29, 2025

Compare projection measures across regions

Typical year · 1991–2020

When to visit

This calendar describes typical regional weather under the selected climate baseline. It is not a forecast for a future trip, and it does not account for crowds, lodging, events, or vineyard access.

Deterministic IFS forecast

Next ten days

Detailed forecast outlook

ECMWF IFS 0.25° via Herbie · model run Aug 30, 2026 at 00:00 UTC · retrieved Aug 30, 2026 at 08:22 UTC

Scroll horizontally to see all forecast dates.

DateSunMonTueWedThuFriSatSunMonTue
High 25°C 30°C 31°C 23°C 17°C 21°C 21°C 24°C 26°C 27°C
Low 12°C 15°C 19°C 15°C 14°C 12°C 12°C 12°C 12°C 15°C
Rain 0.0 mm 0.0 mm 0.0 mm 2.9 mm 3.8 mm 0.4 mm 1.8 mm 0.0 mm 0.0 mm 0.0 mm

Across the typical year: Late July has the warmest median afternoon high (32.8°C); Late December has the coolest (3.6°C). Wet days are most frequent in Late November (38%) and least frequent in Early July (4%). Ties are resolved by calendar order.

Typical afternoon highs and overnight lowsMedians and middle 50% of daily readings

Afternoon highOvernight lowMiddle 50%

Scroll horizontally to inspect all 24 half-month periods.

Typical afternoon highs and overnight lows for Yakima & Central Columbia Basin Median daily maximum and minimum temperatures for 24 early and late-month periods under the 1991–2020 baseline. Neutral bands show the 25th to 75th percentile. -10°C0°C10°C20°C30°C40°C JanFebMarAprMayJunJulAugSepOctNovDec
How often a day is wetShare of days with at least 1 mm of rain

Scroll horizontally to inspect all 24 half-month periods.

Wet-day frequency through the typical year for Yakima & Central Columbia Basin The fraction of days receiving at least one millimeter of rain in each early and late-month period under the 1991–2020 baseline. 0%25%50%75%100% JanFebMarAprMayJunJulAugSepOctNovDec
View all 24 periods as a table

Scroll horizontally to view all columns.

Yakima & Central Columbia Basin typical weather by half-month, 1991–2020
PeriodAfternoon high, median (middle 50%)Overnight low, median (middle 50%)Wet-day frequencyPeriod rain, median (middle 50%)
Jan 1–154.4°C (0.6–8.0°C)-2.2°C (-5.6–0.0°C)37%17.4 mm (10.7–24.7 mm)
Jan 16–315.5°C (2.0–8.6°C)-1.7°C (-4.0–0.3°C)33%20.5 mm (10.2–28.4 mm)
Feb 1–157.8°C (5.1–10.0°C)-1.7°C (-3.9–1.1°C)31%11.9 mm (9.0–20.1 mm)
Feb 16–299.4°C (6.8–11.5°C)-1.2°C (-3.4–1.1°C)29%11.5 mm (7.6–19.3 mm)
Mar 1–1511.6°C (9.4–14.7°C)0.4°C (-1.5–2.4°C)28%11.1 mm (8.6–22.9 mm)
Mar 16–3113.9°C (11.8–15.8°C)1.6°C (-0.3–3.4°C)27%13.1 mm (8.6–17.6 mm)
Apr 1–1515.4°C (13.5–18.1°C)3.1°C (0.9–5.2°C)27%11.3 mm (9.1–17.2 mm)
Apr 16–3018.1°C (15.9–21.3°C)4.7°C (2.7–6.7°C)23%8.5 mm (4.6–18.5 mm)
May 1–1520.6°C (17.8–24.7°C)6.8°C (4.2–9.1°C)20%10.7 mm (5.7–14.8 mm)
May 16–3123.2°C (20.1–26.4°C)9.3°C (7.1–11.2°C)26%14.6 mm (5.4–25.0 mm)
Jun 1–1524.9°C (22.0–27.8°C)10.5°C (8.6–12.4°C)20%10.8 mm (3.5–15.6 mm)
Jun 16–3027.6°C (24.7–30.8°C)11.9°C (10.0–14.1°C)13%4.8 mm (2.5–9.6 mm)
Jul 1–1530.7°C (27.9–34.1°C)13.8°C (12.0–15.9°C)4%1.3 mm (0.3–3.9 mm)
Jul 16–3132.8°C (30.3–35.7°C)15.2°C (13.3–17.0°C)6%1.7 mm (0.2–3.9 mm)
Aug 1–1532.6°C (29.7–35.1°C)14.9°C (12.9–16.8°C)6%0.5 mm (0.1–5.4 mm)
Aug 16–3130.4°C (27.9–32.8°C)13.2°C (11.5–15.0°C)6%1.6 mm (0.5–3.8 mm)
Sep 1–1527.6°C (24.4–30.7°C)10.9°C (8.6–12.9°C)8%2.0 mm (0.3–7.4 mm)
Sep 16–3024.5°C (21.7–27.5°C)8.8°C (6.6–10.6°C)11%3.6 mm (0.9–7.7 mm)
Oct 1–1519.4°C (17.1–22.2°C)5.7°C (3.3–8.0°C)16%6.9 mm (3.4–13.3 mm)
Oct 16–3116.0°C (13.6–18.1°C)3.1°C (0.9–5.8°C)28%13.9 mm (6.4–20.6 mm)
Nov 1–1511.2°C (8.7–13.6°C)1.2°C (-1.7–3.6°C)28%13.3 mm (6.4–22.3 mm)
Nov 16–308.4°C (4.6–10.7°C)-0.6°C (-3.6–1.7°C)38%17.4 mm (10.1–26.8 mm)
Dec 1–155.0°C (1.3–7.9°C)-2.2°C (-5.0–0.0°C)36%18.5 mm (11.0–25.8 mm)
Dec 16–313.6°C (1.1–6.5°C)-2.8°C (-4.7–-0.8°C)37%21.0 mm (12.2–29.3 mm)

Each year contributes to temperature or rain separately when at least 90% of that period’s days are present. A value is shown only when at least 80% of the baseline years qualify. February 29 is included in late February.

Historical climatology Last Updated August 20, 2026

Season to date

Growing season heat and rainfall

Mar 15–Aug 29, 2026

Growing degree days1424.6base 10°C
Growing-season rainfall58.5 mmweighted regional total
Cumulative growing degree daysBase 10°C

2026 season1991–2020 average

Growing degree days accumulated during the 2026 growing season The solid line accumulates daily mean temperature above 10 degrees Celsius from the configured growing-season start. The dashed line shows the 1991–2020 daily climatological average. 1425 GDD 0 Mar ’26AprMayJunJulAug
Cumulative growing-season rainfallRegional weighted mean

2026 season1991–2020 average

Rainfall accumulated during the 2026 growing season The solid line accumulates daily rainfall in millimeters from the configured growing-season start. The dashed line shows the 1991–2020 daily climatological average. 96 mm 0 Mar ’26AprMayJunJulAug
View growing-season accumulation data
DateSeason GDD1991–2020 average GDDSeason rainfall1991–2020 average rainfall
2026-03-150.00.50.1 mm1.3 mm
2026-03-160.00.80.3 mm2.3 mm
2026-03-173.41.00.4 mm3.3 mm
2026-03-187.21.20.4 mm3.8 mm
2026-03-1914.01.30.4 mm4.3 mm
2026-03-2019.91.50.4 mm5.2 mm
2026-03-2122.11.62.2 mm6.0 mm
2026-03-2222.11.72.2 mm7.3 mm
2026-03-2322.12.02.3 mm8.2 mm
2026-03-2422.82.33.2 mm9.5 mm
2026-03-2523.22.53.7 mm10.5 mm
2026-03-2623.22.83.7 mm11.5 mm
2026-03-2723.23.13.7 mm12.5 mm
2026-03-2823.33.33.7 mm13.5 mm
2026-03-2923.33.83.8 mm14.5 mm
2026-03-3023.34.43.8 mm15.1 mm
2026-03-3123.35.33.8 mm15.8 mm
2026-04-0123.36.38.0 mm16.7 mm
2026-04-0223.37.111.0 mm17.3 mm
2026-04-0323.38.012.3 mm17.9 mm
2026-04-0423.98.612.3 mm18.8 mm
2026-04-0526.99.112.3 mm19.4 mm
2026-04-0631.99.912.3 mm20.4 mm
2026-04-0737.411.112.3 mm21.3 mm
2026-04-0839.012.412.3 mm22.3 mm
2026-04-0941.313.612.3 mm23.5 mm
2026-04-1044.414.712.3 mm24.2 mm
2026-04-1148.815.713.2 mm25.0 mm
2026-04-1251.616.915.1 mm26.0 mm
2026-04-1354.618.016.1 mm27.3 mm
2026-04-1454.618.716.4 mm28.5 mm
2026-04-1554.619.517.9 mm29.2 mm
2026-04-1654.620.718.3 mm30.0 mm
2026-04-1754.622.218.5 mm30.7 mm
2026-04-1855.523.918.5 mm31.2 mm
2026-04-1959.225.818.5 mm31.8 mm
2026-04-2065.628.318.5 mm32.6 mm
2026-04-2172.731.120.9 mm33.1 mm
2026-04-2276.133.535.9 mm33.8 mm
2026-04-2377.935.838.9 mm34.6 mm
2026-04-2478.138.040.0 mm35.6 mm
2026-04-2578.140.140.0 mm36.2 mm
2026-04-2678.342.440.0 mm37.1 mm
2026-04-2780.445.440.0 mm37.9 mm
2026-04-2883.348.040.0 mm39.0 mm
2026-04-2987.250.540.0 mm39.5 mm
2026-04-3093.053.040.0 mm40.2 mm
2026-05-01100.255.640.0 mm40.5 mm
2026-05-02110.558.740.0 mm41.1 mm
2026-05-03121.461.940.0 mm41.9 mm
2026-05-04132.965.640.0 mm42.7 mm
2026-05-05144.369.740.0 mm43.4 mm
2026-05-06155.173.640.0 mm44.0 mm
2026-05-07164.377.740.0 mm44.5 mm
2026-05-08172.482.140.0 mm45.3 mm
2026-05-09179.486.140.0 mm46.1 mm
2026-05-10187.390.540.0 mm46.5 mm
2026-05-11194.495.640.0 mm47.1 mm
2026-05-12203.4100.740.0 mm47.7 mm
2026-05-13211.0105.942.7 mm48.6 mm
2026-05-14215.4111.543.5 mm49.5 mm
2026-05-15218.1117.543.6 mm51.3 mm
2026-05-16219.8123.744.0 mm52.5 mm
2026-05-17222.0129.744.3 mm53.9 mm
2026-05-18226.1135.544.3 mm55.2 mm
2026-05-19232.1141.644.4 mm56.4 mm
2026-05-20238.9147.344.4 mm58.1 mm
2026-05-21246.5152.244.4 mm59.5 mm
2026-05-22255.0157.644.4 mm60.5 mm
2026-05-23265.2163.644.4 mm61.1 mm
2026-05-24275.8170.644.4 mm61.6 mm
2026-05-25285.6177.545.7 mm62.4 mm
2026-05-26291.4184.147.1 mm63.2 mm
2026-05-27299.6190.847.1 mm63.9 mm
2026-05-28312.4197.548.7 mm64.6 mm
2026-05-29321.8204.851.6 mm65.2 mm
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2026-06-04370.5253.551.6 mm70.7 mm
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2026-06-06383.4268.851.8 mm73.0 mm
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2026-06-19513.0371.454.8 mm80.7 mm
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2026-06-22552.3400.354.8 mm82.0 mm
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2026-06-24579.8420.354.8 mm82.6 mm
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2026-07-281048.5854.457.9 mm90.9 mm
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2026-08-101225.41035.357.9 mm93.1 mm
2026-08-111239.71048.457.9 mm93.3 mm
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2026-08-131268.21074.757.9 mm93.5 mm
2026-08-141281.71088.257.9 mm93.7 mm
2026-08-151296.41101.658.2 mm93.8 mm
2026-08-161311.71114.758.4 mm94.2 mm
2026-08-171327.41127.758.4 mm94.4 mm
2026-08-181343.81140.858.4 mm94.5 mm
2026-08-191358.81153.858.4 mm94.7 mm
2026-08-201375.51166.558.4 mm94.9 mm
2026-08-211393.31178.858.4 mm95.1 mm
2026-08-221411.41190.258.5 mm95.7 mm
2026-08-231424.61201.258.5 mm96.1 mm

Forecast outlook

ECMWF IFS 0.25° via Herbie · run Aug 30, 2026 at 00:00 UTC

10-day totals compared with the 1991–2020 combined regional record

GDD accumulation
90 GDDvs 99 GDD average
Total rainfall
8.9 mmvs 3.0 mm average

No unusually hot or wet period stands out in the short-range forecast.

Sun8/30 25°Cavg 29°C 12°Cavg 13°C +8 GDD 0.0 mm
Mon8/31 30°Cavg 29°C 15°Cavg 12°C +12 GDD 0.0 mm
Tue9/1 31°Cavg 29°C 19°Cavg 12°C +14 GDD 0.0 mm
Wed9/2 23°Cavg 29°C 15°Cavg 12°C +9 GDD 2.9 mm
Thu9/3 17°Cavg 29°C 14°Cavg 12°C +5 GDD 3.8 mm
Fri9/4 21°Cavg 28°C 12°Cavg 12°C +6 GDD 0.4 mm
Sat9/5 21°Cavg 28°C 12°Cavg 11°C +6 GDD 1.8 mm
Sun9/6 24°Cavg 28°C 12°Cavg 11°C +8 GDD 0.0 mm
Mon9/7 26°Cavg 27°C 12°Cavg 11°C +9 GDD 0.0 mm
Tue9/8 27°Cavg 27°C 15°Cavg 11°C +12 GDD 0.0 mm

Data and methods

Show data sources and model assumptions

Current temperature, dew point, humidity, and wind use geographically weighted NWS station observations. The 24-hour rain total and 10-day outlook use the 00 UTC deterministic ECMWF IFS 0.25° public forecast retrieved directly with Herbie. Historical temperature and rain combine qualifying GHCN-D stations with ERA5 by geographic area; a missing station day uses the nearest ERA5 value for that station's area. Climate comparisons use 1991–2020.

Forecast comparisons use the 1991–2020 combined regional daily record. Daily high and low averages use the matching date; rainfall and GDD sum the same calendar dates as the forecast period.

This service is based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF). Weather & Vines subsets, converts, and regionally weights the forecast fields. ECMWF data are published under CC BY 4.0. ECMWF accepts no liability for errors, omissions, availability, loss, or damage arising from their use.

Climate projections use NASA NEX-GDDP-CMIP6 v2.0, accessed August 23, 2026, with 25 models. Weather & Vines subsets and aggregates the source fields. Source files and derived projection data are under CC BY-SA 4.0; the full roster and limitations are listed in the climate atlas methods.

The Yakima & Central Columbia Basin model uses a March 15–October 31 growing season, base 10°C GDD, and an operational hot-day marker of 35°C.

The historical series uses 4 ERA5 locations, 22 temperature stations, and 23 rain stations. Interpretation confidence: high. Geometry confidence: reviewed-approximate. Rules: columbia-valley-catalog-v1-2026-07.